Enviro HL SERIES User Manual

ENVIRO-TEC
39
FORM ET115.24-NOM11 (118)
Fan motor starts
but stops. [Psc
motor]
Voltage or ground loss at motor Verify proper voltage and ground at motor.
Blower blocked
Clear blockage. Verify blower rotates freely with motor
disconnected.
Loss of fan speed command.
Verify operation of thermostat or controller. If 24v unit,
verify fan speed command at relay board. Refer to fan
relay board troubleshooting guide.
Motor overloaded
Use amp meter to verify motor amps. Disconnect power
to unit. Verify motor rotates freely by hand with blower
disconnected. If not, replace motor.
Open ductwork Verify ducts sealed properly.
Motor overheated due to lack
of airow
Verify dampers, if present, are not closed. Verify there
are no obstructions in the discharge ductwork and/or at
the plenum opening. Verify lter is not dirty and does not
obstruct airow.
Voltage or ground loss at motor
Verify proper voltage and ground at motor power
terminals.
Motor fault or end of life. Replace motor.
Faulty motor harness
Reseat connector and verify operation. Disconnect motor
harnesses and verify continuity. Replace motor harness.
Excessive fan
noise
Motor mounting bolts loose Tighten motor mounting bolts.
Motor shaft bent Replace motor.
Motor bearing end of life
Disconnect power from unit. Verify motor rotates freely
by hand with blower disconnected.
Motor overloaded
Verify static pressure per system design. Use amp meter
to verify motor amps. Disconnect power to unit. Verify
motor rotates freely with power disconnected. If not,
replace motor.
Motor end of life Use amp meter to verify motor amps. Replace motor.
Dirty lters Verify lters. Replace as needed.
Obstructed airow
Verify blower is unobstructed. Verify no duct obstruction.
Verify dampers are full open.
Improper duct connections
Verify ductwork is installed per smacna and ashrae
guidelines.
Static pressure too low Verify static pressure per system design.
Improperly balanced system Verify airow through connected ductwork
Fan wheel rubbing on fan
housing
Remover power from unit. Align wheel in housing.
Loose fan wheel
Remover power from unit. Align wheel in housing and
tighten.
Damaged fan wheel
Inspect fan wheel to verify ns are not bent. Replace
blower as needed.
Imbalanced fan wheel Inspect fan wheel. Replace as needed.

Enviro HL SERIES Specifications

General

Brand	Enviro
Model	HL SERIES
Category	Fan
Language	English